Thomas Rhett helped his youngest daughter Ada James kick off her 2nd birthday in the sweetest way, even if she wasn't totally awake for it.

Rhett shared a video on Instagram on Monday (August 12) that shows the birthday girl waking up to her dad and mom serenading her "Happy Birthday." As Ada comes around the corner and into the kitchen, she's greeted by Rhett, who is in full dad mode, ready with his camera as he sings and films her.

Despite her sleepy state, her hair draped her face, a pacifier in her mouth and her hands covering her eyes, Rhett adorably wishes not-so-baby Ada a happy birthday, gently brushing her hair out of her face as he sings to her.

WATCH: Willa Gray Steals the Spotlight!

"Happy 2nd birthday to my sleepy baby girl. Love you so much AJ! I really wish time would stop and you would stay this little forever (and preferably sleep like an hour longer each morning)," the country singer writes in a caption that accompanies the adorable video.

Ada James was born on Aug. 12, 2017, three months after the couple adopted her older sister Willa Gray, 3, from Uganda. Rhett and wife Lauren Akins recently announced that they're expecting their third child, another daughter! They shared the exciting news with fans via a gender reveal video that caught them firing pink dust out of a powder cannon.

"I feel so blessed to say that our third child is on the way and it’s a girl!!" Rhett shared after the announcement. " I love you so much @laur_akins. WG and AJ, y’all are gonna be the best big sisters! Bring on the crazy."